Specifies the number of samples the input buffer can hold for each channel in the task. Zero indicates to allocate no buffer. Use a buffer size of 0 to perform a hardware-timed operation without using a buffer. Setting this property overrides the automatic input buffer allocation that NI-DAQmx performs.

Specifies the number of samples the output buffer can hold for each channel in the task. Zero indicates to allocate no buffer. Use a buffer size of 0 to perform a hardware-timed operation without using a buffer. Setting this property overrides the automatic output buffer allocation that NI-DAQmx performs.

Specifies a virtual channel or list of virtual channels to modify. The virtual channels are within the context of a specific task. NI-DAQmx configures all channels in the task if you do not set this property.

Specifies the maximum value you expect to measure. This value is in the units you specify with a units property. When you query this property, it returns the coerced maximum value that the device can measure with the current settings.

Specifies the minimum value you expect to measure. This value is in the units you specify with a units property. When you query this property, it returns the coerced minimum value that the device can measure with the current settings.

Indicates the channel that acquires the temperature of the cold junction if AI.Thrmcpl.CJCSrc is Channel. If the channel is a temperature channel, NI-DAQmx acquires the temperature in the correct units. Other channel types, such as a resistance channel with a custom sensor, must use a custom scale to scale values to degrees Celsius.

Specifies whether to read from the channel if it is a cold-junction compensation channel. By default, DAQmx Read does not return data from cold-junction compensation channels. Setting this property to TRUE forces read operations to return the cold-junction compensation channel data with the other channels in the task.

Specifies the voltage level at which to recognize waveform repetitions. You should select a voltage level that occurs only once within the entire period of a waveform. You also can select a voltage that occurs only once while the voltage rises or falls.

Specifies the maximum instantaneous sound pressure level you expect to measure. This value is in decibels, referenced to 20 micropascals. NI-DAQmx uses the maximum sound pressure level to calculate values in pascals for AI.Max and AI.Min for the channel.

Specifies the decibel reference level in the units of the channel. When you read samples as a waveform, the decibel reference level is included in the waveform attributes. NI-DAQmx also uses the decibel reference level when converting AI.SoundPressure.MaxSoundPressureLvl to a voltage level.

Specifies the sensitivity of the 4 wire DC voltage acceleration sensor connected to the channel. This value is the units you specify with AI.Accel.4WireDCVoltage.SensitivityUnits. Refer to the sensor documentation to determine this value.

Specifies the sensitivity of the charge acceleration sensor connected to the channel. This value is the units you specify with AI.Accel.Charge.SensitivityUnits. Refer to the sensor documentation to determine this value.

Specifies an array of coefficients for the polynomial that converts electrical values to physical values. Each element of the array corresponds to a term of the equation. For example, if index three of the array is 9, the fourth term of the equation is 9x^3.

Specifies an array of coefficients for the polynomial that converts physical values to electrical values. Each element of the array corresponds to a term of the equation. For example, if index three of the array is 9, the fourth term of the equation is 9x^3.

Specifies the source of the channel. You can use the signal from the I/O connector or one of several calibration signals. Certain devices have a single calibration signal bus. For these devices, you must specify the same calibration signal for all channels you connect to a calibration signal.

Specifies in volts the output voltage of the bridge while not under load. NI-DAQmx subtracts this value from any measurements before applying scaling equations. If you set AI.Bridge.InitialRatio, NI-DAQmx coerces this property to AI.Bridge.InitialRatio times AI.Excit.ActualVal. This property is set by DAQmx Perform Bridge Offset Nulling Calibration. If you set this property, NI-DAQmx coerces AI.Bridge.InitialRatio to the value of this property divided by AI.Excit.ActualVal. If you set both this property and AI.Bridge.InitialRatio, and their values conflict, NI-DAQmx returns an error. To avoid this error, reset one property to its default value before setting the other.

Specifies in volts per volt the ratio of output voltage from the bridge to excitation voltage supplied to the bridge while not under load. NI-DAQmx subtracts this value from any measurements before applying scaling equations. If you set AI.Bridge.InitialVoltage, NI-DAQmx coerces this property to AI.Bridge.InitialVoltage divided by AI.Excit.ActualVal. If you set this property, NI-DAQmx coerces AI.Bridge.InitialVoltage to the value of this property times AI.Excit.ActualVal. If you set both this property and AI.Bridge.InitialVoltage, and their values conflict, NI-DAQmx returns an error. To avoid this error, reset one property to its default value before setting the other.

Specifies the result of a shunt calibration. This property is set by DAQmx Perform Shunt Calibration. NI-DAQmx multiplies data read from the channel by the value of this property. This value should be close to 1.0.

Specifies if NI-DAQmx divides the measurement by the excitation. You should typically set this property to TRUE for ratiometric transducers. If you set this property to TRUE, set AI.Max and AI.Min to reflect the scaling.

Specifies the actual amount of excitation supplied by an internal excitation source. If you read an internal excitation source more precisely with an external device, set this property to the value you read. NI-DAQmx ignores this value for external excitation. When performing shunt calibration, some devices set this property automatically.

Specifies whether this channel will disable excitation after the task is uncommitted. Setting this to Zero Volts or Amps disables excitation after task uncommit. Setting this attribute to Maintain Existing Value leaves the excitation on after task uncommit.

Specifies whether to synchronize the AC excitation source of the channel to that of another channel. Synchronize the excitation sources of multiple channels to use multichannel sensors. Set this property to FALSE for the master channel and to TRUE for the slave channels.

Specifies whether to apply the open thermocouple detection bias voltage to the channel. Changing the value of this property on a channel may require settling time before the data returned is valid. To compensate for this settling time, discard unsettled data or add a delay between committing and starting the task. Refer to your device specifications for the required settling time. When open thermocouple detection is enabled, use OpenThrmcplChansExist to determine if any channels were open.

Indicates the amount of time between when the ADC samples data and when the sample is read by the host device. This value is in the units you specify with AI.FilterDelayUnits. You can adjust this amount of time using AI.FilterDelayAdjustment.

Specifies the ADC timing mode, controlling the tradeoff between speed and effective resolution. Some ADC timing modes provide increased powerline noise rejection. On devices that have an AI Convert clock, this setting affects both the maximum and default values for AIConv.Rate. You must use the same ADC timing mode for all channels on a device, but you can use different ADC timing modes for different devices in the same task.

Specifies whether to enable dithering. Dithering adds Gaussian noise to the input signal. You can use dithering to achieve higher resolution measurements by over sampling the input signal and averaging the results.

Specifies whether to enable the sample and hold circuitry of the device. When you disable sample and hold circuitry, a small voltage offset might be introduced into the signal. You can eliminate this offset by using AI.AutoZeroMode to perform an auto zero on the channel.

Specifies for NI-DAQmx to map hardware registers to the memory space of the application, if possible. Normally, NI-DAQmx maps hardware registers to memory accessible only to the kernel. Mapping the registers to the memory space of the application increases performance. However, if the application accesses the memory space mapped to the registers, it can adversely affect the operation of the device and possibly result in a system crash.

Indicates the coefficients of a polynomial equation that NI-DAQmx uses to scale values from the native format of the device to volts. Each element of the array corresponds to a term of the equation. For example, if index two of the array is 4, the third term of the equation is 4x^2. Scaling coefficients do not account for any custom scales or sensors contained by the channel.

Specifies the maximum value you expect to generate. The value is in the units you specify with a units property. If you try to write a value larger than the maximum value, NI-DAQmx generates an error. NI-DAQmx might coerce this value to a smaller value if other task settings restrict the device from generating the desired maximum.

Specifies the minimum value you expect to generate. The value is in the units you specify with a units property. If you try to write a value smaller than the minimum value, NI-DAQmx generates an error. NI-DAQmx might coerce this value to a larger value if other task settings restrict the device from generating the desired minimum.

Specifies whether to ground the internal DAC reference. Grounding the internal DAC reference has the effect of grounding all analog output channels and stopping waveform generation across all analog output channels regardless of whether the channels belong to the current task. You can ground the internal DAC reference only when AO.DAC.Ref.Src is Internal and AO.DAC.Ref.AllowConnToGnd is TRUE.

Specifies whether to enable reglitching. The output of a DAC normally glitches whenever the DAC is updated with a new value. The amount of glitching differs from code to code and is generally largest at major code transitions. Reglitching generates uniform glitch energy at each code transition and provides for more uniform glitches. Uniform glitch energy makes it easier to filter out the noise introduced from glitching during spectrum analysis.

Specifies an additional amount of time to wait between when the sample is written by the host device and when the sample is output by the DAC. This delay adjustment is in addition to the value indicated by AO.FilterDelay. This delay adjustment is in the units you specify with AO.FilterDelayUnits.

Specifies whether to write samples directly to the onboard memory of the device, bypassing the memory buffer. Generally, you cannot update onboard memory directly after you start the task. Onboard memory includes data FIFOs.

Specifies for NI-DAQmx to map hardware registers to the memory space of the application, if possible. Normally, NI-DAQmx maps hardware registers to memory accessible only to the kernel. Mapping the registers to the memory space of the application increases performance. However, if the application accesses the memory space mapped to the registers, it can adversely affect the operation of the device and possibly result in a system crash.

Indicates the coefficients of a linear equation that NI-DAQmx uses to scale values from a voltage to the native format of the device. Each element of the array corresponds to a term of the equation. The first element of the array corresponds to the y-intercept, and the second element corresponds to the slope. Scaling coefficients do not account for any custom scales that may be applied to the channel.

Specifies whether to enable bus mode for digital filtering. If you set this property to TRUE, NI-DAQmx treats all lines that use common filtering settings as a bus. If any line in the bus has jitter, all lines in the bus hold state until the entire bus stabilizes, or until 2 times the minimum pulse width elapses. If you set this property to FALSE, NI-DAQmx filters all lines individually. Jitter in one line does not affect other lines.

Specifies whether to tristate the lines in the channel. If you set this property to TRUE, NI-DAQmx tristates the lines in the channel. If you set this property to FALSE, NI-DAQmx does not modify the configuration of the lines even if the lines were previously tristated. Set this property to FALSE to read lines in other tasks or to read output-only lines.

Specifies the logic family to use for acquisition. A logic family corresponds to voltage thresholds that are compatible with a group of voltage standards. Refer to the device documentation for information on the logic high and logic low voltages for these logic families.

Specifies for NI-DAQmx to map hardware registers to the memory space of the application, if possible. Normally, NI-DAQmx maps hardware registers to memory accessible only to the kernel. Mapping the registers to the memory space of the application increases performance. However, if the application accesses the memory space mapped to the registers, it can adversely affect the operation of the device and possibly result in a system crash.

Specifies the logic family to use for generation. A logic family corresponds to voltage thresholds that are compatible with a group of voltage standards. Refer to the device documentation for information on the logic high and logic low voltages for these logic families.

Specifies the current threshold in Amperes for the channel. A value of 0 means the channel observes no limit. Devices can monitor only a finite number of current thresholds simultaneously. If you attempt to monitor additional thresholds, NI-DAQmx returns an error.

Specifies whether to write samples directly to the onboard memory of the device, bypassing the memory buffer. Generally, you cannot update onboard memory after you start the task. Onboard memory includes data FIFOs.

Specifies for NI-DAQmx to map hardware registers to the memory space of the application, if possible. Normally, NI-DAQmx maps hardware registers to memory accessible only to the kernel. Mapping the registers to the memory space of the application increases performance. However, if the application accesses the memory space mapped to the registers, it can adversely affect the operation of the device and possibly result in a system crash.

Specifies the maximum value you expect to measure. This value is in the units you specify with a units property. When you query this property, it returns the coerced maximum value that the hardware can measure with the current settings.

Specifies the minimum value you expect to measure. This value is in the units you specify with a units property. When you query this property, it returns the coerced minimum value that the hardware can measure with the current settings.

Specifies in seconds the length of time to measure the frequency of the signal if CI.Freq.MeasMeth is High Frequency with 2 Counters. Measurement accuracy increases with increased measurement time and with increased signal frequency. If you measure a high-frequency signal for too long, however, the count register could roll over, which results in an incorrect measurement.

Specifies the value by which to divide the input signal if CI.Freq.MeasMeth is Large Range with 2 Counters. The larger the divisor, the more accurate the measurement. However, too large a value could cause the count register to roll over, which results in an incorrect measurement.

Specifies in seconds the length of time to measure the period of the signal if CI.Period.MeasMeth is High Frequency with 2 Counters. Measurement accuracy increases with increased measurement time and with increased signal frequency. If you measure a high-frequency signal for too long, however, the count register could roll over, which results in an incorrect measurement.

Specifies the value by which to divide the input signal if CI.Period.MeasMeth is Large Range with 2 Counters. The larger the divisor, the more accurate the measurement. However, too large a value could cause the count register to roll over, which results in an incorrect measurement.

Specifies how to count and interpret the pulses the encoder generates on signal A and signal B. X1, X2, and X4 are valid for quadrature encoders only. Two Pulse Counting is valid for two-pulse encoders only.

Specifies the value to which to reset the measurement when signal Z is high and signal A and signal B are at the states you specify with CI.Encoder.ZIndexPhase. Specify this value in the units of the measurement.

Specifies the states at which signal A and signal B must be while signal Z is high for NI-DAQmx to reset the measurement. If signal Z is never high while signal A and signal B are high, for example, you must choose a phase other than A High B High.

Specifies how to count and interpret the pulses the encoder generates on signal A and signal B. X1, X2, and X4 are valid for quadrature encoders only. Two Pulse Counting is valid for two-pulse encoders only.

Specifies in Hertz the frequency of the counter timebase. Specifying the rate of a counter timebase allows you to take measurements in terms of time or frequency rather than in ticks of the timebase. If you use an external timebase and do not specify the rate, you can take measurements only in terms of ticks of the timebase.

Specifies for NI-DAQmx to map hardware registers to the memory space of the application, if possible. Normally, NI-DAQmx maps hardware registers to memory accessible only to the kernel. Mapping the registers to the memory space of the application increases performance. However, if the application accesses the memory space mapped to the registers, it can adversely affect the operation of the device and possibly result in a system crash.

Specifies the divisor to apply to the signal you connect to the counter source terminal. Scaled data that you read takes this setting into account. You should use a prescaler only when you connect an external signal to the counter source terminal and when that signal has a higher frequency than the fastest onboard timebase. Setting this value disables duplicate count prevention unless you explicitly set CI.DupCountPrevention to TRUE.

Specifies the maximum period (in seconds) in which the device will recognize signals. For frequency measurements, a signal with a higher period than the one set in this property will return 0 Hz. For duty cycle, the device will return 0 or 1 depending on the state of the line during the max defined period of time. Period measurements will return NaN. Pulse width measurement will return zero.

Specifies the duty cycle of the pulses. The duty cycle of a signal is the width of the pulse divided by period. NI-DAQmx uses this ratio and the pulse frequency to determine the width of the pulses and the delay between pulses.

Specifies the terminal of the timebase to use for the counter. Typically, NI-DAQmx uses one of the internal counter timebases when generating pulses. Use this property to specify an external timebase and produce custom pulse widths that are not possible using the internal timebases.

Specifies in Hertz the frequency of the counter timebase. Specifying the rate of a counter timebase allows you to define output pulses in seconds rather than in ticks of the timebase. If you use an external timebase and do not specify the rate, you can define output pulses only in ticks of the timebase.

Indicates if the task completed pulse generation. Use this value for retriggerable pulse generation when you need to determine if the device generated the current pulse. For retriggerable tasks, when you query this property, NI-DAQmx resets it to FALSE.

Specifies constraints to apply when the counter generates pulses. Constraining the counter reduces the device resources required for counter operation. Constraining the counter can also allow additional analog or counter tasks on the device to run concurrently. For continuous counter tasks, NI-DAQmx consumes no device resources when the counter is constrained. For finite counter tasks, resource use increases with the frequency regardless of the constraint mode. However, fixed frequency constraints significantly reduce resource usage, and fixed duty cycle constraint marginally reduces it.

Specifies whether to write samples directly to the onboard memory of the device, bypassing the memory buffer. Generally, you cannot update onboard memory directly after you start the task. Onboard memory includes data FIFOs.

Specifies for NI-DAQmx to map hardware registers to the memory space of the application, if possible. Normally, NI-DAQmx maps hardware registers to memory accessible only to the kernel. Mapping the registers to the memory space of the application increases performance. However, if the application accesses the memory space mapped to the registers, it can adversely affect the operation of the device and possibly result in a system crash.

Specifies the divisor to apply to the signal you connect to the counter source terminal. Pulse generations defined by frequency or time take this setting into account, but pulse generations defined by ticks do not. You should use a prescaler only when you connect an external signal to the counter source terminal and when that signal has a higher frequency than the fastest onboard timebase.

Specifies the point in the buffer at which to begin a read operation. If you also specify an offset with Offset, the read operation begins at that offset relative to the point you select with this property. The default value is Current Read Position unless you configure a Reference Trigger for the task. If you configure a Reference Trigger, the default value is First Pretrigger Sample.

Specifies whether subsequent read operations read all samples currently available in the buffer or wait for the buffer to become full before reading. NI-DAQmx uses this setting for finite acquisitions and only when the number of samples to read is -1. For continuous acquisitions when the number of samples to read is -1, a read operation always reads all samples currently available in the buffer.

Specifies if DAQmx Read automatically starts the task if you did not start the task explicitly by using DAQmx Start Task. The default value is TRUE. When DAQmx Read starts a finite acquisition task, it also stops the task after reading the last sample.

Specifies the path to the TDMS file to which you want to log data. If the file path is changed while the task is running, this takes effect on the next sample interval (if Logging.SampsPerFile has been set) or when DAQmx Start New File is called. New file paths can be specified by ending with "\" or "/". Files created after specifying a new file path retain the same name and numbering sequence.

Specifies whether to enable logging and whether to allow reading data while logging. Log mode allows for the best performance. However, you cannot read data while logging if you specify this mode. If you want to read data while logging, specify Log and Read mode.

Specifies the name of the group to create within the TDMS file for data from this task. If you append data to an existing file and the specified group already exists, NI-DAQmx appends a number symbol and a number to the group name, incrementing that number until finding a group name that does not exist. For example, if you specify a group name of Voltage Task, and that group already exists, NI-DAQmx assigns the group name Voltage Task #1, then Voltage Task #2.

Specifies whether logging is paused while a task is executing. If Logging.Mode is set to Log and Read mode, this value is taken into consideration on the next call to DAQmx Read, where data is written to disk. If Logging.Mode is set to Log Only mode, this value is taken into consideration the next time that data is written to disk. A new TDMS group is written when logging is resumed from a paused state.

Specifies how many samples to write to each file. When the file reaches the number of samples specified, a new file is created with the naming convention of <filename>_####.tdms, where #### starts at 0001 and increments automatically with each new file. For example, if the file specified is C:\data.tdms, the next file name used is C:\data_0001.tdms. To disable file spanning behavior, set this attribute to 0. If Logging.FilePath is changed while this attribute is set, the new file path takes effect on the next file created.

Specifies a size in samples to be used to pre-allocate space on disk. Pre-allocation can improve file I/O performance, especially in situations where multiple files are being written to disk. For finite tasks, the default behavior is to pre-allocate the file based on the number of samples you configure the task to acquire.

Indicates the total number of samples acquired by each channel. NI-DAQmx returns a single value because this value is the same for all channels. For retriggered acquisitions, this value is the cumulative number of samples across all retriggered acquisitions.

Indicates if the device(s) detected a common mode range violation for any virtual channel in the task. Common mode range violation occurs when the voltage of either the positive terminal or negative terminal to ground are out of range. Reading this property clears the common mode range violation status for all channels in the task. You must read this property before you read CommonModeRangeErrorChans. Otherwise, you will receive an error.

Indicates a list of names of any virtual channels in the task for which the device(s) detected a common mode range violation. You must read CommonModeRangeErrorChansExist before you read this property. Otherwise, you will receive an error.

Indicates if the device(s) detected an excitation fault condition for any virtual channel in the task. Reading this property clears the excitation fault status for all channels in the task. You must read this property before you read ExcitFaultChans. Otherwise, you will receive an error.

Indicates a list of names of any virtual channels in the task for which the device(s) detected an excitation fault condition. You must read ExcitFaultChansExist before you read this property. Otherwise, you will receive an error.

Indicates if the device(s) detected an overcurrent condition for any virtual channel in the task. Reading this property clears the overcurrent status for all channels in the task. You must read this property before you read OvercurrentChans. Otherwise, you will receive an error.

Indicates a list of names of any virtual channels in the task for which the device(s) detected an overcurrent condition. You must read OvercurrentChansExist before you read this property. Otherwise, you will receive an error. On some devices, you must restart the task for all overcurrent channels to recover.

Indicates if the device(s) detected an overtemperature condition in any virtual channel in the task. Reading this property clears the overtemperature status for all channels in the task. You must read this property before you read OvertemperatureChans. Otherwise, you will receive an error.

Indicates if the device or devices detected an open channel condition in any virtual channel in the task. Reading this property clears the open channel status for all channels in the task. You must read this property before you read OpenChans. Otherwise, you will receive an error.

Indicates if the device(s) detected an open current loop for any virtual channel in the task. Reading this property clears the open current loop status for all channels in the task. You must read this property before you read OpenCurrentLoopChans. Otherwise, you will receive an error.

Indicates a list of names of any virtual channels in the task for which the device(s) detected an open current loop. You must read OpenCurrentLoopChansExist before you read this property. Otherwise, you will receive an error.

Indicates if the device(s) detected an open thermocouple connected to any virtual channel in the task. Reading this property clears the open thermocouple status for all channels in the task. You must read this property before you read OpenThrmcplChans. Otherwise, you will receive an error.

Indicates a list of names of any virtual channels in the task for which the device(s) detected an open thermocouple. You must read OpenThrmcplChansExist before you read this property. Otherwise, you will receive an error.

Indicates if the device(s) detected an overload in any virtual channel in the task. Reading this property clears the overload status for all channels in the task. You must read this property before you read OverloadedChans. Otherwise, you will receive an error.

Indicates if any device(s) in the task detected the insertion or removal of an accessory since the task started. Reading this property clears the accessory change status for all channels in the task. You must read this property before you read DevsWithInsertedOrRemovedAccessories. Otherwise, you will receive an error.

Indicates the names of any devices that detected the insertion or removal of an accessory since the task started. You must read AccessoryInsertionOrRemovalDetected before you read this property. Otherwise, you will receive an error.

Specifies the number of samples to acquire or generate for each channel if SampQuant.SampMode is Finite Samples. If SampQuant.SampMode is Continuous Samples, NI-DAQmx uses this value to determine the buffer size.

Indicates the maximum Sample Clock rate supported by the task, based on other timing settings. For output tasks, the maximum Sample Clock rate is the maximum rate of the DAC. For input tasks, NI-DAQmx calculates the maximum sampling rate differently for multiplexed devices than simultaneous sampling devices.

Specifies the rate of the Sample Clock Timebase. Some applications require that you specify a rate when you use any signal other than the onboard Sample Clock Timebase. NI-DAQmx requires this rate to calculate other timing parameters.

Specifies the names of the digital lines or ports on which to detect rising edges. The lines or ports must be used by virtual channels in the task. You also can specify a string that contains a list or range of digital lines or ports.

Specifies the names of the digital lines or ports on which to detect falling edges. The lines or ports must be used by virtual channels in the task. You also can specify a string that contains a list or range of digital lines or ports.

Specifies whether to tristate lines specified with ChangeDetect.DI.RisingEdgePhysicalChans and ChangeDetect.DI.FallingEdgePhysicalChans that are not in a virtual channel in the task. If you set this property to TRUE, NI-DAQmx tristates rising/falling edge lines that are not in a virtual channel in the task. If you set this property to FALSE, NI-DAQmx does not modify the configuration of rising/falling edge lines that are not in a virtual channel in the task, even if the lines were previously tristated. Set this property to FALSE to detect changes on lines in other tasks or to detect changes on output-only lines.

Indicates in seconds the amount of time required for the ADCs or DACs on the device to reset. When synchronizing devices, query this property on all devices and note the largest reset time. Then, for each device, subtract the value of this property from the largest reset time and set SyncPulse.ResetDelay to the resulting value.

Specifies in seconds the amount of time to wait after the Synchronization Pulse before resetting the ADCs or DACs on the device. When synchronizing devices, query SyncPulse.ResetTime on all devices and note the largest reset time. Then, for each device, subtract the reset time from the largest reset time and set this property to the resulting value.

Specifies the interval, in Sample Clock periods, between each internal Synchronization Clock pulse. NI-DAQmx uses this pulse for synchronization of triggers between multiple devices at different rates. Refer to device documentation for information about how to calculate this value.

Specifies whether to synchronize recognition of transitions in the signal to the internal timebase of the device. If you set this property to TRUE, the device does not recognize and act upon the trigger until the next pulse of the internal timebase.

Specifies the physical channels to use for pattern matching. The order of the physical channels determines the order of the pattern. If a port is included, the order of the physical channels within the port is in ascending order.

Specifies a hysteresis level in the units of the measurement or generation. If Start.AnlgEdge.Slope is Rising, the trigger does not deassert until the source signal passes below Start.AnlgEdge.Lvl minus the hysteresis. If Start.AnlgEdge.Slope is Falling, the trigger does not deassert until the source signal passes above Start.AnlgEdge.Lvl plus the hysteresis. Hysteresis is always enabled. Set this property to a non-zero value to use hysteresis.

Specifies whether to apply a digital filter to the digital output of the analog triggering circuitry (the Analog Comparison Event). When enabled, the analog signal must stay above or below the trigger level for the minimum pulse width before being recognized. Use filtering for noisy trigger signals that transition in and out of the hysteresis window rapidly.

Specifies whether to apply a digital filter to the digital output of the analog triggering circuitry (the Analog Comparison Event). When enabled, the analog signal must stay within the trigger window for the minimum pulse width before being recognized. Use filtering for noisy trigger signals that transition in and out of the window rapidly.

Specifies whether a finite task resets and waits for another Start Trigger after the task completes. When you set this property to TRUE, the device performs a finite acquisition or generation each time the Start Trigger occurs until the task stops. The device ignores a trigger if it is in the process of acquiring or generating signals.

Specifies the minimum number of pretrigger samples to acquire from each channel before recognizing the reference trigger. Post-trigger samples per channel are equal to SampQuant.SampPerChan minus the number of pretrigger samples per channel.

Specifies the physical channels to use for pattern matching. The order of the physical channels determines the order of the pattern. If a port is included, the order of the physical channels within the port is in ascending order.

Specifies a hysteresis level in the units of the measurement. If Ref.AnlgEdge.Slope is Rising, the trigger does not deassert until the source signal passes below Ref.AnlgEdge.Lvl minus the hysteresis. If Ref.AnlgEdge.Slope is Falling, the trigger does not deassert until the source signal passes above Ref.AnlgEdge.Lvl plus the hysteresis. Hysteresis is always enabled. Set this property to a non-zero value to use hysteresis.

Specifies whether to apply a digital filter to the digital output of the analog triggering circuitry (the Analog Comparison Event). When enabled, the analog signal must stay above or below the trigger level for the minimum pulse width before being recognized. Use filtering for noisy trigger signals that transition in and out of the hysteresis window rapidly.

Specifies whether to apply a digital filter to the digital output of the analog triggering circuitry (the Analog Comparison Event). When enabled, the analog signal must stay within the trigger window for the minimum pulse width before being recognized. Use filtering for noisy trigger signals that transition in and out of the window rapidly.

Indicates whether a completed acquisition was triggered by the auto trigger. If an acquisition has not completed after the task starts, this property returns FALSE. This property is only applicable when Ref.AutoTrig.Enable is TRUE.

Specifies the threshold at which to pause the task. Specify this value in the units of the measurement or generation. Use Pause.AnlgLvl.When to specify whether the task pauses above or below this threshold.

Specifies a hysteresis level in the units of the measurement or generation. If Pause.AnlgLvl.When is Above Level, the trigger does not deassert until the source signal passes below Pause.AnlgLvl.Lvl minus the hysteresis. If Pause.AnlgLvl.When is Below Level, the trigger does not deassert until the source signal passes above Pause.AnlgLvl.Lvl plus the hysteresis. Hysteresis is always enabled. Set this property to a non-zero value to use hysteresis.

Specifies whether to apply a digital filter to the digital output of the analog triggering circuitry (the Analog Comparison Event). When enabled, the analog signal must stay above or below the trigger level for the minimum pulse width before being recognized. Use filtering for noisy trigger signals that transition in and out of the hysteresis window rapidly.

Specifies whether to apply a digital filter to the digital output of the analog triggering circuitry (the Analog Comparison Event). When enabled, the analog signal must stay within the trigger window for the minimum pulse width before being recognized. Use filtering for noisy trigger signals that transition in and out of the window rapidly.

Specifies the physical channels to use for pattern matching. The order of the physical channels determines the order of the pattern. If a port is included, the lines within the port are in ascending order.

Specifies the type of trigger to use to arm the task for a Start Trigger. If you configure an Arm Start Trigger, the task does not respond to a Start Trigger until the device receives the Arm Start Trigger.

Specifies the role of the device in a synchronized system. Setting this value to Master or Slave enables trigger skew correction. If you enable trigger skew correction, set this property to Master on only one device, and set this property to Slave on the other devices.

Indicates if the device(s) detected an overcurrent condition for any channel in the task. Reading this property clears the overcurrent status for all channels in the task. You must read this property before you read OvercurrentChans. Otherwise, you will receive an error.

Indicates a list of names of any virtual channels in the task for which an overcurrent condition has been detected. You must read OvercurrentChansExist before you read this property. Otherwise, you will receive an error.

Indicates if the device(s) detected an overtemperature condition in any virtual channel in the task. Reading this property clears the overtemperature status for all channels in the task. You must read this property before you read OvertemperatureChans. Otherwise, you will receive an error.

Indicates a list of names of any overtemperature virtual channels. You must read OvertemperatureChansExist before you read this property. Otherwise, you will receive an error. The list of names may be empty if the device cannot determine the source of the overtemperature.

Indicates if the device(s) detected an External Overvoltage condition for any channel in the task. Reading this property clears the External Overvoltage status for all channels in the task. You must read this property before you read External OvervoltageChans. Otherwise, you will receive an error.

Indicates a list of names of any virtual channels in the task for which an External Overvoltage condition has been detected. You must read External OvervoltageChansExist before you read this property. Otherwise, you will receive an error.

Indicates if the device(s) detected an overload in any virtual channel in the task. Reading this property clears the overload status for all channels in the task. You must read this property before you read OverloadedChans. Otherwise, you will receive an error.

Indicates if the device(s) detected an open current loop for any channel in the task. Reading this property clears the open current loop status for all channels in the task. You must read this property before you read OpenCurrentLoopChans. Otherwise, you will receive an error.

Indicates a list of names of any virtual channels in the task for which the device(s) detected an open current loop. You must read OpenCurrentLoopChansExist before you read this property. Otherwise, you will receive an error.

Indicates if the device(s) detected a power supply fault for any channel in the task. Reading this property clears the power supply fault status for all channels in the task. You must read this property before you read PowerSupplyFaultChans. Otherwise, you will receive an error.

Indicates a list of names of any virtual channels in the task that have a power supply fault. You must read PowerSupplyFaultChansExist before you read this property. Otherwise, you will receive an error.

Indicates if any devices in the task detected the insertion or removal of an accessory since the task started. Reading this property clears the accessory change status for all channels in the task. You must read this property before you read DevsWithInsertedOrRemovedAccessories. Otherwise, you will receive an error.

Indicates the names of any devices that detected the insertion or removal of an accessory since the task started. You must read AccessoryInsertionOrRemovalDetected before you read this property. Otherwise, you will receive an error.

Specifies that the next samples written are the last samples you want to generate. Use this property when performing continuous generation to prevent underflow errors after writing the last sample. RegenMode must be Do Not Allow Regeneration to use this property.

Indicates the number of Boolean values expected per channel in a sample for line-based writes. This property is determined by the channel in the task with the most digital lines. If a channel has fewer lines than this number, NI-DAQmx ignores the extra Boolean values.

Specifies if DAQmx Wait for Next Sample Clock and DAQmx Read convert late errors to warnings. NI-DAQmx returns no late warnings or errors until the number of warmup iterations you specify with NumOfWarmupIters execute.

Specifies the number of loop iterations that must occur before DAQmx Wait for Next Sample Clock and DAQmx Read return late warnings or errors. The system stabilizes over a number of iterations. The amount of jitter during this period can delay reads and writes. The default number of warmup iterations is 100. Increase the number of iterations as necessary to stabilize the system.

Specifies whether DAQmx Read returns late errors or warnings when it detects missed Sample Clock pulses. This setting does not affect DAQmx Wait for Next Sample Clock. Set this property to TRUE for applications that need to detect lateness without using DAQmx Wait for Next Sample Clock.

Specifies the watchdog timer behavior when the network connection is lost between the host and the chassis. If set to true, the watchdog timer expires when the chassis detects the loss of network connection.

Specifies in seconds the amount of time until the watchdog timer expires. A value of -1 means the internal timer never expires. Set this input to -1 if you use an Expiration Trigger to expire the watchdog task.

Recently Viewed Topics

This site uses cookies to offer you a better browsing experience. Learn more about our privacy policy.